Chapter 4 : Chemical Compositions in a Cell

Question 1

Name the 3 properties of water

Answer 1

1. Polarity
2. Cohesive & Adhesive force
3. Specific heat capacity

Question 2

Explain polarity of water

Answer 2

• Water is an inorganic compound
• Water molecules are polar molecules. Because shared electrons between oxygen and hydrogen will attracted to oxygen becuz it’s more electronegative.
• This polarity produce hydrogen bonds and allows water to act as a universal solvent

Question 3

Explain cohesive force of water

Answer 3

• Water molecules attached to each other through cohesive force

Question 4

Explain adhesive force of water

Answer 4

• Water molecules attached to other surfaces through adhesive force

Question 5

Explain specific heat capacity of water

Answer 5

• 4.2 kJ kg-1 ‘C-1 <— specific heat capacity of water

- 4.2 kJ of energy is required to raise the temperature of 1kg of water by 1’C

Question 6

Types of carbohydrates (3 types)

Answer 6

1. monosaccharides
2. disaccharides
3. polysaccharides